Bearing-protecting sleeve



C. E. H. APPELT.

BEARING PROTECTING SLEEVE.

APPLICATION FILED JULY 23. I920.

Patented Dec. 14, 1920.

gwuento'c Qhcwhas? (Woke/W I m d MP betw- Strum UNITED STATES OFFICE;

CHARLES E. H. APPELT, OF ROYAL OAK, MICHIGAN, ASSIG-NQR OF ONE-HALF T0WILLIAM E. THIERBY, 0F DETROIT, MICHIGAN.

.BEARINGPROTEGTING SLEEVE.

Application filed July 23, 1920.

To all whom it may, GO'IZCGIH.

Be it known that I, CrmnLns E. H. Arrnn'r, a citizen of the UnitedStates, and residing at Royal Oak, in the county of Oakland and State ofMichigan, have invented a new and Improved Bearing-Protecting Sleeve, ofwhich the following is a specification.

This invention relates to the manufacture of armatures for electricmotors and generators, and its object is to provide means forpreventinginsulating liquid such as varnish or lacquer from coating the mainjournal of the armature shaft when the armature is dipped, and theinvention consists in a sleeve adapted to slip over the journal and awasher to prevent the escape of the air with in the sleeve, which airconstitutes a seal to prevent the insulating liquid from rising andcovering the journal.

In the accompanying drawing, Figure 1 is an elevation of an armature ina bath of insulating liquid. Fig. 2 is a section on the line 22 ofFig. 1. Fig. 3 is a perspective of a resilient retainer.

Similar reference characters refer to like parts throughout the severalviews.

The varnish, lacquer or other liquid into which the armatures ofelectric motors and generators are dipped preparatory to baking is quitedifficult to remove from the journals, especially where the windings ofthe armatures extend out over such journals. It is at present customaryafter the armatures are dipped, drained and baked, to place them in aproper lathe chuck and remove the coatings from the journals by means ofan abrasive such as sand or emery paper or cloth. As a result, thehighly polished journals often become scratched and otherwise injured.

To prevent the coating liquid from covering the journals, the deviceshown in the drawing has been devised. It consists of a sleeve 1,preferably of metal, having a central bore 2 of sufficient size tofreely admit the journal 3 of the shaft 4: of the armature 5, and itsexternal diameter is sufiiciently small to permit the sleeve to extendwithin the windings 6 of the armature. The sleeve is formed with acounterbore 7 of sufficient size to admit the collar 8 on the shaft sothat the lower end of the sleeve may engage the upper disk of thearmature core.

T he sleeve is preferably formed with two Specification of LettersPatent.

Patented Dec. 14, 1920.

Serial No. 398,530.

additional counterbores 9 and 10 to receive the resilient washers l2 and13 of felt, leather or rubber, or other material which may closeair-tight the space between the shaft and sleeve. lVhen felt or leatherwashers are employed, they are preferably filled with a heavy oil toprevent the passage of air. Their normal internal diameter so that thepossibility of leakage is reduced to a minimum. A resilient retainer 14:is sprung in position. It will be understood that only one of thesewashers is necessary to form the air seal, but two hold the sleeve inbetter alinement.

One of these sleeves with its washers is slipped down onto each journal3 before the armature and its shaft is dipped. As the air can not escapefrom the counterbores 7 and 9, the liquid of the bath can not risewithin these counterbores above the collar 8 and the ournal 3 will notbe coated. The time required to apply and afterward to remove the sleeveand its washers is'much less than that now generally required to removethe coating from the journal and the danger of injuring the polishedjournal by the abrasive employed is entirely obviated. The resilientretainers 14 hold the washers in position, while the sleeves are beingslipped onto and off the shafts.

The sleeves 1 may be of metal, fiber, wood or any other suitablematerial and are removed from the shaft before the armature is bakedafter the dipping. The sizes and proportions of these sleeves may bevaried as may be found necessary by those skilled in the art withoutdeparting from the spirit of my invention as set forth in the followingclaims.

I claim 1. In combination, a sleeve adapted to be slipped over a journalof the shaft of an armature of an electric machine, which sleeve isprovided with a counterbore and a circumferential groove in the wall ofthe counterbore, a washer within the counterbore adapted to fillair-tight the space between the sleeve and journal, and a resilientretainer seated in the groove to hold the washer in position.

2. In combination, a sleeve adapted to be slipped over a journal of theshaft of an armature of an electric machine, and a resilient washerWithin the sleeve to prevent less than the diameter of the journal 3 thepassage of air through the sleeve around the journal. 7

3. In combination, a sleeve adapted to be slipped over a journal of thearmature shaft of an electric machine, a resilient Washer Within thesleeve at each side of the middle thereof to aline the sleeve on thejournal and prevent the passage of air through the sleeve around thejournal.

4. In combination, a sleeve adapted to be slipped over a journal of thearmature shaft of an electric machine, a resilient Washer Within thesleeve at each side of the middle thereof to aline the sleeve on thejournal and prevent the passage of air through the sleeve around thejournal, and resilient means to hold the Washers in position.

5. In combination, a sleeve adapted to be slipped over a journal of thearmature shaft of an electric machine, said sleeve having a counterboreat each end, a resilient Washer Within each counterbore to aline thesleeve on the journal and to prevent the passage of air through thesleeve around the journal.

6. In combination, a sleeve adapted to he slipped over a journal of thearmature shaft of an electric machine, said sleeve having a counterboreat each end, a resilient Washer Within each counterbore to aline thesleeve on the journal and to prevent the passage of air through thesleeve around the journal, said sleeve being formed With internalcircumferential grooves adjacent the outer ends of said Washers, andresilient retainers mounted in said grooves to hold the Washers inposition.

CHARLES E. H. APPELT.

